1. (1) The commission is authorized to collect and submit hair samples for testing in quarter horses and mixed breed races. For horses which have been entered to race, the hair sample may be collected at any time prior to post time, or a sample may be collected in the test barn following the race. If a sample is collected after a horse is entered into, but prior to competing in a race, a positive report received based on the sample collected will be considered a post race violation. Hair samples may also be collected for out of competition testing.
2. (2) The commission or its designee will comply with the official testing laboratories guidelines for hair sample collection and storage.

3. (3) The presence of any prohibited substances that appears in a pre- or post-race sample including, but not limited to, clenbuterol, zilpaterol, and ractopamine in QH and mixed breed races, will constitute a violation.

   The presence of a therapeutic medication with an established threshold level for that breed which appears in a hair sample will not be considered a violation.

4. (4) Samples collected for out of competition testing in quarter horses that result in a positive finding for a prohibited substance as listed in WAC 260-70-545 will be reported to the board of stewards and considered a violation.

   The presence of clenbuterol in an out of competition test in a quarter horse will result in the horse being placed on the official veterinarians list for a minimum of thirty days or until a sample is submitted and is reported as negative for the presence of clenbuterol. If, at the owners request a sample is submitted for screening for removal from the official veterinarians list, the owner(s) are responsible for the cost of the testing.

5. (5) If a horse is selected for hair testing and the mane is less than four and one-half inches in length, the commission may elect to collect a hair sample using the tail.

[Statutory Authority: RCW 67.16.020. WSR 18-07-014, § 260-70-665, filed 3/9/18, effective 4/9/18.]